Calculate the mass of 180 molecules of C3H6. The atomic masses of C and H are 12.01 amu/atom and 1.008 amu/atom respectively.

Mass = 1257.71 ×10²³ g

Explanation:

Given data:

Number of molecules of C₃H₆ = 180 molecules

Atomic mass of C = 12.01 amu/atom

Atomic mass of H = 1.008 amu/atom

Mass of C₃H₆ = ?

Solution:

1 mole contain 6.022×10²³ molecules

180 molecules × 1 mol  / 6.022×10²³ molecules

29.89×10²³  mol

Mass of C₃H₆:

Mass = number of moles × molar mass

Molar mass = 12.01×3 + 1.008×6 = 42.078 g/mol

Mass = 29.89×10²³  mol × 42.078 g/mol

Mass = 1257.71 ×10²³ g